The sline sills will not fit over the S3 skirts, end of, the S3 sills are taller as they actually go over the top of the skirts that actually fit over the area where the seals sit anyway, the Sline sills are to short as in height, trust me smoothie it isnt going to happen, need to buy S3 sills.
Buy new as removal always distorts the alum insert given the double sided tape sticks like a weld & remove all traces of existing double sided tape from the car prior to fitment of new sills as it may not sit flush.
Omg jungle mate. Didn't know you didn't have the FBSW! I'm sorry mate but it's gotta jump right to the from of your mod plans..plus chicks dig it lol. Damn man..hurry up!
Better save quickly then lmfao.